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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae0b429b2860f252ef4d813f4dcd07408301612c06c6bc84ab59510db60dcc9' 
  AND token = 'hBslumgbrV3gvnrjfdEzgmvRitu2Z3NAgk3QP02f1iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}